Solar tracker bearing apparatus

ABSTRACT

A solar tracker bearing apparatus mountable to an upright support post for rotatably supporting a torque tube beam of a solar tracker assembly and including: a rotatable bearing assembly supported for rotation about an axis of rotation by a stationary saddle assembly. The rotatable bearing assembly includes a central portion and first and second spaced apart arcuate peripheral portions, the central portion defining a torque tube beam slot, the first arcuate peripheral portion including a first arcuate rim bearing and the second arcuate peripheral portion including a second arcuate rim bearing, and the first and second rim bearings being spaced apart in a direction parallel to the axis of rotation of the rotatable bearing assembly. The stationary saddle assembly includes a first arcuate bearing race slidably supporting the first arcuate rim bearing and a spaced apart second arcuate bearing race slidably support the second arcuate rim bearing.

TECHNICAL FIELD

The present disclosure relates to a solar tracker bearing assembly orapparatus for a solar tracker system including a plurality ofphotovoltaic modules supported on a frame assembly and, morespecifically, to a solar tracker bearing assembly including a rotatablebearing assembly supported for rotation about an axis of rotation by astationary saddle assembly, the rotatable bearing assembly includesfirst and second bearing members defining an interior beam slot forreceiving a central or torque tube beam of the solar tracker system andfirst and second spaced apart peripheral rim bearings, and thestationary saddle assembly including first and second saddle membersdefining first and second spaced apart arcuate bearing racesrespectively receiving the first and second peripheral rim bearings.

BACKGROUND

Various types of solar tracker systems are known including a horizontal,single axis solar tracker system. A horizontal, single axis solartracker system includes a frame for supporting a plurality ofphotovoltaic modules. The frame includes a torque tube beam and an arraymodule rails which support the plurality of photovoltaic modules. Thetorque tube beam is typically comprised of one or more torque tube beamsegments affixed in a linear fashion by collars between adjacent segmentends. The torque tube beam may be comprised of a plurality of segmentsof predetermined length, i.e., 40 foot segments. The module rails aretypically spaced uniformly along the torque tube beam and attached tothe torque tube beam via a plurality brackets. The photovoltaic modules,in turn, are secured to the module rails via a plurality of clampsbetween adjacent pairs of the rails. An extent of the frame extends intwo dimensions, length, generally perpendicular to the path or arc ofthe sun in the sky, and width, generally parallel to the path of sun inthe sky. An actuator mechanism, such as a slew drive, is coupled to thetorque tube beam to pivot or swing the torque tube beam about an axis ofrotation to change an angle of inclination of the frame and therebyadjust the light receiving surfaces of the plurality of photovoltaicmodules to track the movement of the sun across the sky so that thephotovoltaic modules are maximally exposed to the sun to throughout theday. That is, the goal of the solar tracker system is to move or pivotthe frame about an axis of rotation such that the light absorbingsurfaces of the photovoltaic modules is generally orthogonal to theposition of the sun, within, of course, the limits of the angle ofinclination range of the solar tracking system frame.

In one typical embodiment of a single axis, horizontal solar trackersystem, the torque tube beam extends horizontally along the length ofthe frame and, to achieve a proper balance, module rails are orthogonalto and centered about the torque tube beam so that a total weight of theframe and the plurality of photovoltaic modules, and associated clampsand brackets/fasteners, is approximately equally distributed on eitherside of the torque tube beam. A slew drive is approximately centeredalong the length of the torque tube beam and includes first and secondcouplers. A first portion of the torque tube beam is affixed to andextends from the first coupler on one side of the slew drive and asecond portion of the torque tube beam is affixed to and extends fromthe second coupler on the opposite side of the slew drive. For example,the first portion of the torque tube beam may extend north from the slewdrive and may be comprised of five 40 foot torque tube beam segments,while, the second portion of the torque tube beam may extend south fromthe slew drive and may similarly be comprised of five 40 foot torquetube beam segments, thus providing a total north-south extent or lengthof the torque tube beam of 400 feet. The slew drive pivots a table ofthe solar tracker system. The table of the solar tracking system iseverything that pivots or swings about the axis of rotation andincludes: a) the frame including the torque tube and the module rails;b) the photovoltaic modules; and c) the movable portions of a pluralityof solar tracking bearing apparatuses that support the torque tube alongits length. The axis of rotation of the solar tracker system extendsparallel to the torque tube beam.

The torque tube beam is supported for pivoting movement about the axisof rotation by the plurality of solar tracker bearing apparatuses. Eachof the solar tracker bearing apparatuses are affixed to a respective oneof a plurality of spaced apart upright support posts which are anchoredto or anchored in a substrate, such as the ground. The upright supportposts are stationary and support the plurality of solar tracker bearingapparatuses, which, in turn, pivotally support the frame and theplurality of photovoltaic modules. Typically, one solar tracker bearingapparatus is mounted or coupled to each upright support post. Each solartracker bearing apparatus includes a stationary portion, affixed to asupport post, and a rotating portion, which rotates about the axis ofrotation. Additionally, the slew drive is also mounted to its ownsupport post.

The plurality of solar tracker bearing apparatuses pivotally support thetorque tube beam for movement or pivoting about the axis of rotation.The actuator/controller mechanism, i.e., the slew drive, coupled to thetorque tube beam provides to motive force to pivot the table about theaxis of rotation and thus change the angle of inclination of the table.The plurality of solar tracker bearing apparatuses rotatably disposedbetween the torque tube beam and the upright support posts permit thetorque tube beam to pivot with respect to the upright support posts andthereby allows the angle of inclination of the frame to be changed bythe slew drive such that the plurality of photovoltaic module aremaximally exposed to the sun within the range of the angle ofinclination of the solar tracking system. The axis of rotation of thetable of the solar tracker system is defined by a combination of alignedindividual axes of rotation of the individual solar tracker bearingapparatuses. The slew drive is positioned such that it pivots the torquetube beam about the axis of rotation.

Solar tracker systems are often erected or installed at remote locationswhere sun exposure is maximized. As such, the solar tracker bearingapparatuses are utilized in outdoor locations, exposed to varying andpotentially harsh weather conditions such as high wind conditions. Moreover such each solar tracker bearing apparatus receives a portion of atorque tube beam and thus supports a portion of the weight of the solartracker frame and photovoltaic modules, when the frame and modules aresubject to wind loads, snow loads and the like, such forces aretransmitted via the torque tube beam through the solar tracker bearingapparatuses to the support posts. Thus, the solar tracker bearingapparatuses are subject to forces, including vector or linear forces ofvarious directions and magnitudes, as well as various torque forces.Accordingly, it is desirable that a solar tracker bearing apparatusesbe: a) durable and low maintenance over the useful life of theapparatuses; b) able to withstand linear and torque forces applied tothe bearing apparatus; c) provide for stable support of the torque tubebeam and the weight of the frame and photovoltaic modules over anextended useful life; d) easy to assemble on site at remote locations byworkers with varying skill levels; and e) include mounting adjustmentcapability along multiple axes to compensate for the fact that themounting surfaces provided by an individual upright support post may notbe in perfect alignment with the torque tube beam to be received androtatably supported by the solar tracker bearing apparatus. Providingsuch a solar tracker bearing apparatus is a continuing challenge fordesigners.

SUMMARY

In one aspect, the present disclosure relates to a solar tracker bearingapparatus mountable to a support post for pivotally supporting a torquetube beam of a solar tracker assembly, the solar tracker bearingapparatus comprising: a rotatable bearing assembly supported forrotation about an axis of rotation by a saddle assembly, the rotatablebearing assembly including a central portion and first and second spacedapart arcuate peripheral portions, the central portion defining a torquetube beam slot, the first arcuate peripheral portion including a firstarcuate rim bearing and the second arcuate peripheral portion includinga second arcuate rim bearing, the first and second rim bearings beingspaced apart in a direction parallel to the axis of rotation of therotatable bearing assembly; and the saddle assembly including a lowercoupling portion and an upper bearing portion, the upper bearing portionincluding a first arcuate bearing race and a spaced apart second arcuatebearing race, the first and second arcuate bearing races being spacedapart in a direction parallel to the axis of rotation of the rotatablebearing assembly, the first arcuate bearing race slidably supporting thefirst arcuate rim bearing of the rotatable bearing assembly and thesecond arcuate bearing race slidably supporting the second arcuate rimbearing of the rotatable bearing assembly, the first arcuate bearingrace including an inner bearing race and a radially spaced apart outerbearing race, the inner bearing race providing sliding bearing supportfor an inner surface of the first rim bearing and the outer bearing raceproviding sliding bearing support for an outer surface of the first rimbearing and the second arcuate bearing race including an inner bearingrace and a radially spaced apart outer bearing race, the inner bearingrace providing sliding bearing support for an inner surface of thesecond rim bearing and the outer bearing race providing sliding bearingsupport for an outer surface of the second rim bearing.

In another aspect, the present disclosure relates to a solar trackerbearing apparatus mountable to a support post for pivotally supporting atorque tube beam of a solar tracker assembly, the solar tracker bearingapparatus comprising: a rotatable bearing assembly supported forrotation about an axis of rotation by a saddle assembly, the rotatablebearing assembly including a torque tube beam slot and a first bearingmember and a second bearing member affixed to the first bearing member,the first bearing member including a central region and a laterallyextending peripheral rim and the second bearing member including acentral region and a laterally extending peripheral rim, the laterallyextending peripheral rim of the first bearing member including a firstarcuate rim bearing and the laterally extending peripheral rim of thesecond bearing member including a second arcuate rim bearing, the firstand second rim bearings being spaced apart in a direction parallel tothe axis of rotation of the rotatable bearing assembly, the centralregion of the first bearing member including a cut out in an upperportion of the central region and a projection adjacent the cut outextending in a direction parallel to the axis of rotation of therotatable bearing assembly toward the second bearing member, the centralregion of the second bearing member including a cut out in an upperportion of the central region and a projection adjacent the cut out andextending in a direction parallel to the axis of rotation of therotatable bearing assembly toward the first bearing member, facingsurfaces of the projections of the first bearing member and the secondbearing member abutting to space apart the central regions of the firstand second bearing members and the cut out of the first bearing memberand the cut out of the second bearing member and the projection of thefirst bearing member and the projection of the second bearing memberbeing part of the torque tube beam slot of the rotatable bearingassembly; and the saddle assembly including a lower coupling portion andan upper bearing portion, the upper bearing portion including a firstarcuate bearing race and a spaced apart second arcuate bearing race, thefirst and second arcuate bearing races being spaced apart in a directionparallel to the axis of rotation of the rotatable bearing assembly, thefirst arcuate bearing race slidably supporting the first arcuate rimbearing of the first bearing member of the rotatable bearing assemblyand the second arcuate bearing race slidably supporting the secondarcuate rim bearing of the second bearing member of the rotatablebearing assembly, the first arcuate bearing race including an innerbearing race and a radially spaced apart outer bearing race, the innerbearing race providing sliding bearing support for an inner surface ofthe first rim bearing and the outer bearing race providing slidingbearing support for an outer surface of the first rim bearing and thesecond arcuate bearing race including an inner bearing race and aradially spaced apart outer bearing race, the inner bearing raceproviding sliding bearing support for an inner surface of the second rimbearing and the outer bearing race providing sliding bearing support foran outer surface of the second rim bearing.

In another aspect, the present disclosure relates to a solar trackerbearing apparatus mountable to a support post for pivotally supporting atorque tube beam of a solar tracker assembly, the solar tracker bearingapparatus comprising: a rotatable bearing assembly supported forrotation about an axis of rotation by a saddle assembly, the rotatablebearing assembly including a central portion and first and second spacedapart arcuate peripheral portions, the central portion defining a torquetube beam slot, the first arcuate peripheral portion including a firstarcuate rim bearing and the second arcuate peripheral portion includinga second arcuate rim bearing, the first and second rim bearings beingspaced apart in a direction parallel to the axis of rotation of therotatable bearing assembly; and the saddle assembly including a firstsaddle member and a second saddle member affixed to the first saddlemember, the first saddle member including an upper bearing regionincluding the first arcuate bearing race and a lower support region, thelower support region including a projection extending in a directionparallel to the axis of rotation of the rotatable bearing assemblytoward the second saddle member and the second saddle member includingan upper bearing region including the second arcuate bearing race and alower support region, the lower support region including a projectionextending in a direction parallel to the axis of rotation of therotatable bearing assembly toward the first saddle member, facingsurfaces of the projections of the first saddle member and the secondsaddle member abutting to space apart the first and second arcuatebearing races, the first arcuate bearing race slidably supporting thefirst arcuate rim bearing of the rotatable bearing assembly and thesecond arcuate bearing race slidably supporting the second arcuate rimbearing of the rotatable bearing assembly, the first arcuate bearingrace including an inner bearing race and a radially spaced apart outerbearing race, the inner bearing race providing sliding bearing supportfor an inner surface of the first rim bearing and the outer bearing raceproviding sliding bearing support for an outer surface of the first rimbearing and the second arcuate bearing race including an inner bearingrace and a radially spaced apart outer bearing race, the inner bearingrace providing sliding bearing support for an inner surface of thesecond rim bearing and the outer bearing race providing sliding bearingsupport for an outer surface of the second rim bearing.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other features and advantages of the presentdisclosure will become apparent to one skilled in the art to which thepresent disclosure relates upon consideration of the followingdescription of the disclosure with reference to the accompanyingdrawings, wherein like reference numerals, unless otherwise describedrefer to like parts throughout the drawings and in which:

FIG. 1 is a schematic perspective view of a solar tracker assemblyincluding a plurality of solar tracker bearing apparatuses of thepresent disclosure;

FIG. 2 is a schematic front elevation view of a first exemplaryembodiment a solar tracker bearing apparatus of the present disclosuremounted to the upper mounting portion of a support post;

FIG. 3 is a schematic side elevation view of the solar tracker bearingapparatus of FIG. 2 and additionally includes a portion of a torque tubebeam of a frame assembly of the solar tracker assembly;

FIG. 4 is a schematic perspective view of the solar tracker bearingapparatus of FIG. 2;

FIG. 5 is a schematic exploded perspective view of the solar trackerbearing apparatus of FIG. 2;

FIG. 6 is a schematic top plan view of the solar tracker bearingapparatus of FIG. 2 with a hold down bracket of a rotatable bearingassembly of the solar tracker bearing apparatus removed for clarity;

FIG. 7 is a schematic bottom plan view of the solar tracker bearingapparatus of FIG. 2;

FIG. 8 is a schematic longitudinal section view of the solar trackerbearing apparatus of FIG. 2 as seen from a plane indicated by the line8-8 in FIG. 3;

FIG. 9 is a schematic longitudinal section view of the solar trackerbearing apparatus of FIG. 2 as taken along an axis of rotation of therotatable bearing assembly of the solar tracker bearing apparatus;

FIG. 10 is a schematic back plan view of a first saddle member of asaddle assembly of the solar tracker bearing apparatus of FIG. 2;

FIG. 11 is a schematic top plan view of a W brace of a connectingassembly of the solar tracker bearing apparatus of FIG. 2;

FIG. 12 is a schematic top plan view of a post cap of the connectingassembly of the solar tracker bearing apparatus of FIG. 2;

FIG. 13 is a schematic top plan view of a stiffener member of theconnecting assembly of the solar tracker bearing apparatus of FIG. 2;

FIG. 14 is a schematic front perspective view of the solar trackerbearing apparatus of FIG. 2 with a shim positioned in a beam slot of therotatable bearing assembly; and

FIG. 15 is a schematic front elevation view of the solar tracker bearingapparatus of FIG. 14; and

FIG. 16 is a schematic exploded front perspective view of the solartracker bearing apparatus of FIG. 14.

DETAILED DESCRIPTION

The present disclosure relates to a solar tracker bearing assembly orapparatus 200 for a solar tracker system 100 which permits andconstrains a torque tube beam 150 of the system 100 to pivot or swingabout an axis of rotation R. A plurality of solar tracker bearingapparatuses 200 are positioned at spaced apart locations along thetorque tube beam 150 to pivotally support the torque tube beam 150.Advantageously, each of the plurality of solar tracker bearingapparatuses 200 includes a stationary saddle assembly 400 that rotatablysupports and defines the axis of rotation R for a rotatable bearingassembly 300. That is, the rotatable bearing assembly 300 is confined torotate about the axis of rotation R by the saddle assembly 400. In turn,the rotatable bearing assembly 300 supports the torque tube beam 150 andconstrains the torque tube beam 150 to pivot or swing about the axis ofrotation R. Thus, the axis of rotation R that the torque tube beam 150is constrained to swing or pivot about is defined by the solar trackerbearing apparatus 200.

The solar tracker system 100 includes components that move or pivotabout the axis of rotation R and other components which are stationary.The components of the solar tracker system 100 that pivot about the axisof rotation R are referred to as the table 110 of the solar trackersystem and include: a) a frame 120 including the torque tube beam 150and an array or plurality of module rails 130 affixed to the torque tubebeam 150; b) a plurality of photovoltaic modules 190; c) the rotatablebearing assemblies 300 of the plurality of solar tracking bearingapparatuses 200 that support the torque tube 150 along its length; andd) associated brackets, clamps, fasteners, etc. that affix thephotovoltaic modules 190 to the frame 120 and secure the components ofthe frame 120 together. Stationary components of the solar trackersystem 100 include: a) a plurality of upright support posts 170 thatsupport the saddles 400 of the solar tracer bearing apparatuses 200; b)the saddles 400 of the plurality of solar tracking bearing apparatuses200; and c) an actuator/drive 180 that is coupled to the torque tubebeam 150 and provides the motive power for pivoting the torque tube beam150 and the table 110 though an angle of inclination AI, In oneexemplary embodiment, the actuator/drive 180 is a slew motor thatbisects the torque tube beam 150 along its length L at approximately amidpoint and is positioned on a support post 170 such that it drives thetorque tube beam 150 and the table 110 about the axis of rotation R.

The plurality of solar tracker bearing apparatuses 200 are positionedalong the torque tube beam 150 such that the bearing apparatuses 200 aresubstantially parallel to but spaced from a longitudinal axis LA of thetorque tube beam 150. The individual axis of rotation R of each is theplurality of solar tracker bearing apparatuses 200 are thussubstantially aligned to or coincident forming a single or combined axisof rotation CR. That is, the axis of rotation R of each of the solartracker bearing apparatuses 200 are substantially coincident with thecombined axis of rotation CR of the plurality of solar tracker bearingapparatuses 200. Hence, hereinafter when reference is made to the axisof rotation R of a given solar tracker bearing apparatus 200 it is to beunderstood that this axis of rotation R is part of and coincident withthe combined axis of rotation CR of the plurality of solar trackerbearing apparatuses 200. Thus, reference will only be made to the axisof rotation R both for a specific solar tracker bearing apparatus 200 orthe plurality of solar tracker bearing apparatuses 200.

Much of the weight of the table 110 is accounted for by the plurality ofphotovoltaic modules 190 which are supported by the array or pluralityof module rails 130 in a position that is generally vertically above thetorque tube beam 150. A vertical direction V is shown FIG. 1. As such, acenter of mass CM of the table 110 if calculated, will typically befound to be vertically aligned with the longitudinal axis of the torquetube beam 110, but positioned vertically above an upper wall 156 of thetorque tube beam 110, that is, outside of and vertically above thetorque tube beam 150. Of course, the exact position or location of thecenter of mass CM of the table 110 will depend on the configuration, andweight of the components comprising the table 110 of the solar trackersystem 100. For proper balance and stability of the table 110 undervarying load conditions (i.e., wind and snow loads, etc.), it isadvantageous if the axis of rotation R of the plurality of solar trackerbearing apparatuses 200 passes through or passes as close as possible tothe center of mass CM of the table 110. Since the axis of rotation R isdetermined by rotating path of travel of the rotatable bearingassemblies 300 of the plurality of solar tracker bearing apparatuses200, the toque tube beam 150 which is disposed within a beam slot 306 ofthe rotatable bearing assemblies 300 is constrained to pivot or swingabout the axis of rotation R. As best seen in FIG. 8, in one exemplaryembodiment, the axis of rotation R is spaced from and outside of thewalls of the torque tube beam 150. A periphery of the beam slot 306 isbounded by and defined by an upper wall 314 and axially spaced apartlower or bottom wall 310 wall and first and second laterally spacedapart side walls 308. The upper wall 314 of the beam slot 306 is definedby a lower wall 392 of a hold down bracket 390 of the rotatable bearingassembly 300. Extending through a center of the beam slot 306, asdefined by beam slot walls 314, 310, 308 is a longitudinally orhorizontally extending central beam slot axis BSA.

As best seen in FIG. 8, in one exemplary embodiment, the axis ofrotation R of the rotatable bearing assembly is spaced from and isoutside of the beam slot 306, as defined by beam slot walls 314, 310,308 and the axis of rotation R is vertically aligned with and spacedabove the central beam slot axis BSA. As best seen in FIG. 15, the beamslot 306 of the rotatable bearing assembly 300 has a depth D.Advantageously, as schematically depicted in FIGS. 14-16, a shim 396 maybe affixed to the rotatable bearing assembly 300 and a horizontalcentral portion 397 of the shim 396 extends through the beam slot 306.The horizontal central portion 397 of the shim 396 is adjacent to andoverlies a bottom wall 310 of the beam slot 306 and bears against alower wall 157 of the torque tube beam 150 thereby effectivelyvertically raising the torque tube beam 150 by a thickness T (FIG. 15)of the horizontal central portion 397 of the shim 396 with respect tothe bottom wall 310 of the beam slot 306. That is, when the shim 396 isin place (as shown in FIGS. 14-16) the effective bottom wall 310 a ofthe beam slot 306 is an upper surface 397 a of the horizontal centralportion 397 of the shim 396. Positioning the shim 396 adjacent thebottom wall 310 of the beam slot 310 advantageously adjusts or raises inthe upward vertical direction V the center of mass CM of the table 110to thereby more closely align the center of mass CM of the table 110with the axis of rotation R of the solar tracker bearing apparatus 200.That is, without the use of a shim 396, e.g., FIG. 8, if the center ofmass CM of the table 110 is vertically below the axis of rotation R ofthe plurality of solar tracker bearing apparatuses 200, the shim 396having an appropriate thickness T of the horizontal central portion 397is selected and installed in the beam slot 306 of the rotatable bearingassembly 300 of each solar tracker bearing apparatus 200. By doing so,the center of mass CM of the table 110 may advantageously be raisedupwardly in the vertical direction V by the thickness T such that thecenter of mass CM table 100 is closer to alignment with the axis ofrotation R of the plurality of solar tracker bearing apparatuses 200. Assuch and advantageously, the center of mass CM of the table 110 may beadjusted through the use of a selected shim 396, or the absence of ashim 396, in the beam slot 306 to change the vertical position of thecenter of mass CM of the table 110 and thereby come closer to theobjective of having the axis of rotation R of the plurality of solartracker bearing apparatuses 200 pass through or pass as close aspossible to the center of mass CM of the table 110. The closer the axisof rotation R of the plurality of solar tracker bearing apparatuses 200is to passing as close as possible to the center of mass CM of the table110, the more nearly the table 110 is in balance.

As can be seen in a comparison of FIGS. 8 and 15, if no shim 396 ispresent in the beam slot 306 to elevate the torque tube beam 150 (andthereby elevate the center of mass CM of the table 110), the centralbeam slot axis BSA of the beam slot 306 is coincident with thelongitudinal axis LA of the torque tube beam 150 (FIG. 8) and if theshim 396 is present in the beam slot 306 such that the torque tube beam150 is elevated in the vertical direction V, the central beam slot axisBSA of the beam slot 306 is still coincident with the longitudinal axisLA of the torque tube beam 150 because the effective lower wall 310 a ofthe beam slot 306 is defined by the upper surface 397 a of thehorizontal central surface 397 of the shim 396. In one exemplaryembodiment, the thickness T of the shim 396 is 0.120 in.

As mentioned previously, the solar tracker system 100 includes the frame120 comprising the torque tube beam 150 and the array of orthogonallyoriented module rails 130 which are affixed to the torque tube beam 150by brackets 160. Fasteners may also be used in place of or in additionto brackets. The plurality of photovoltaic panels or modules 190 (onlyan exemplary one of which is shown in FIG. 1) are supported betweenadjacent pairs of the module rails 130. A typical size of a photovoltaicpanel 190 is one meter by two meters. Thus, a width W of the table 110of the solar tracker system 100, in one exemplary embodiment, isapproximately two meters.

A length L of the table 110 of the solar tracker system 100 is primarilydetermined by an extent or length of the torque tube beam 150. In oneexemplary embodiment, the torque tube beam 150 is comprised of aplurality of predetermined lengths or segments, i.e., 40 foot segments,which are coupled together in an end to end configuration by collars.For simplicity, in FIG. 1, a shortened, schematic version of the torquetube beam 150 is shown. In one exemplary embodiment, the torque tubebeam 150 includes a first portion 152 and a second portion 154 extendingfrom either side of the actuator/controller mechanism, namely, the slewdrive 180. That is, the slew drive 180, which rotates the torque tubebeam 150, bisects or interrupts the torque tube beam 150 at or near alongitudinal center along the length L of the beam 150, The firstportion 152 of the torque tube beam 150 extends from a first coupler 182affixed to one side of the slew drive 180, while the second portion 154of the torque tube beam 150 extends from a second coupler (not shown)affixed to an opposite side of the slew drive 180. As noted above, theschematic representation of the solar tracking system 100 depicted inFIG. 1 includes a relatively short toque tube beam 150. In reality, thelength of the torque tube beam 150 may include five 40 foot beamsegments comprising the first portion 152 of the torque tube beam 150and five 40 foot beam segments comprising the second portion 154 of thetorque tube beam 150 for a total length of approximately 400 feet and anability to over 100 photovoltaic modules 190.

The plurality module rails 130 are typically oriented in an east-westorientation and the supported photovoltaic modules 190, which may extendbeyond the ends of modules rails 130, define the width W of the table110, while the torque tube beam 150 is typically oriented in anorth-south orientation and defines the length L of the table 110. Eachof the plurality of module rails 130 are affixed to the torque tube beam150 by a support bracket 160. The torque tube beam 150 extends in anorth-south direction, while the plurality of module rails 130 extend inan east-west direction 120. In one exemplary embodiment, the torque tubebeam 150 is substantially square in cross section, having a hollowinterior, and is centered about a torque tube beam longitudinal axis LA.In one exemplary embodiment the torque tube beam 150 is approximately100 mm. by 100 mm. (approximately 4 in. by 4 in.).

The solar tracker system 100 further includes the plurality of spacedapart aligned upright support posts 170 which are anchored to oranchored in a substrate G (FIG. 2), such as the ground or a roof of abuilding. To minimize torque load on the posts 170, the posts 170typically extend upwardly in the vertical direction V. The plurality ofupright support posts 170 are aligned along an extent or length of thetorque tube beam 150 and are spaced apart, typically uniformly, alongthe length of the torque tube beam 150. Each post 170 includes a centerline or central vertical axis PCVA (FIG. 2) that extends through anapproximate cross sectional center of the support post 170. Ideally, ifthe support post 170 is installed properly, the post center line orcentral vertical axis PCVA would be vertical. However, due to terraindifficulties and other installation issues, it may be the case that thepost center line PCVA is slightly off vertical, resulting in one type ofmisalignment condition. Further, ideally, each of the plurality ofsupport posts 170 would be positioned such that a vertical center lineCLP of each support post 170 would intersect the longitudinal axis LA ofthe torque tube beam 150. Again, however, due to terrain difficultiesand other installation issues, it may be the case that the post centerline PCVA does not intersect the longitudinal axis LA of the torque tubebeam 150, resulting in another type of misalignment condition. Moreover,each support post 170 includes a pair of spaced apart side walls 174.Each of the side walls 174 include a pair of vertically orientedmounting slots 176. Ideally, each of the plurality of support posts 170,when installed, would have the side walls 174 oriented such that theyare parallel to the longitudinal axis LA of the torque tube beam 170.Again, however, due to terrain difficulties and other installationissues, it may be the case that the post side wall 174 that include themounting slots 176 are off from being parallel with the longitudinalaxis LA of the torque tube beam 170, resulting in yet another type ofmisalignment condition. Advantageously, the solar tracker bearingapparatus 200 of the present disclosure provides for mountingadjustability in the mounting and orientation of the solar trackingbearing apparatus 200 to an upper mounting portion 172 of the supportpost 170 to account for several common misalignment conditions. That is,a connecting structure or assembly 500 and a lower coupling portion 402of a saddle assembly 400 of the solar tracker bearing apparatus 200 havesufficient degrees of freedom or ranges of adjustability when coupled tothe upper mounting portion 172 of the support post 170 to account forseveral of such misalignment conditions (within limits of the ranges ofadjustability provided by the connecting assembly 500 and the saddleassembly 400).

As best seen in FIGS. 3-9, mounted to the upper mounting portion 172 ofeach support post 190 is the solar tracker bearing apparatus 200 whichreceives and rotatably supports a longitudinally extending portion ofthe torque tube beam 150. As mentioned previously, the solar trackersystem 100 further includes the controller mechanism, such as the slewmotor 180, which is coupled to the torque tube beam portions 152, 154and acts to change an angle of inclination AI (FIG. 2) of the table 110and thereby adjust light receiving surfaces of the plurality ofphotovoltaic modules 190 to track the movement of the sun across the skyfrom east to west so that the photovoltaic modules 190 are maximallyexposed to the sun to throughout the day, within the limits or the rangeof the angle of inclination AI as provided by the slew motor 180 and theconfiguration of the table 110. It should be understood that the angleof inclination AI shown in FIG. 2 represent a maximum rotational orpivotal movement of a rotatable bearing assembly 300 of the solartracker bearing apparatus 200 about its axis of rotation R in onedirection (shown in dashed line in FIG. 2 as a clockwise rotation aboutthe axis of rotation R) with respect to a home position of the rotatablebearing assembly 300 (shown in solid line). The rotatable bearingassembly 300 may also rotate or pivot in an opposite direction, acounterclockwise direction, an angular movement or rotation equal toangle of inclination AI.

Solar Tracker Bearing Apparatus 200

As noted above, the number of solar tracker bearing apparatuses 200 in asolar tracker system 100 will depend on the number of upright supportposts 170. Typically each support post 170 will include a solar trackerbearing apparatus 200 affixed to the upper mounting portion 172 of thepost 170 and, thus, the torque tube beam 150 will be supported along itslength or extent by a plurality spaced apart bearing apparatuses 200.Each bearing apparatus 200 will receive and provide bearing support to alongitudinally extending portion 151 of the torque tube beam 150 andeach bearing apparatus 200 thus will support a portion of the totalweight of the torque tube beam 150, the frame 120 and the plurality ofphotovoltaic modules 190. Typically, the torque tube beam 150 will beoriented in a generally north-south horizontal position such that as thetable 110 pivots, the angle of inclination AI of the table 110 changesto track the sun across the sky from east to west to keep the lightreceiving surfaces of the plurality of photovoltaic modules 190 aimed,to the extent possible, at the sun to maximize sunlight exposure of themodules 190 throughout the day.

Each solar tracker bearing apparatus 200 of the plurality of solartracker bearing apparatuses is substantially identical and includes therotatable bearing assembly 300 supported for pivoting or rotation aboutthe axis of rotation R by the stationary saddle assembly 400. Therotatable bearing assembly 300 of the solar tracker bearing apparatus200 is pivotal along a single axis or axis of rotation R. Thus, thebearing apparatus 200 may be referred to as a single axis bearingassembly or single axis tracker. For simplicity purposes, reference tothe solar tracker bearing apparatus 200 will be understood to apply toeach of the plurality of solar tracker bearing apparatuses 200 utilizedin a specific solar tracker system 100. Further, the axis of rotation Rof the respective rotatable bearing assemblies 300 of each solar trackerbearing apparatus 200 of the solar tracker assembly 100 is substantiallyaligned or coincident and is spaced from and parallel to thelongitudinal axis LA of the torque tube beam 150. As used herein, adirection X (or X direction) is a horizontal direction that isorthogonal to the vertical direction V and is substantially parallel tothe longitudinal axis LA of the torque tube beam 150 and issubstantially parallel to the axis of rotation R of each of the solartracker bearing apparatuses 200. Assuming that the torque tube beam 150extends in a generally north-south horizontal direction as mentionedabove, the direction X as used herein will be a north-south horizontaldirection. Thus, the direction X is parallel to the axis of rotation Rof the rotatable bearing assembly 300 of any given solar tracker bearingapparatus 200. Similarly, as used herein, a direction Y (or Y direction)is a horizontal direction that is orthogonal to the vertical direction Vand is substantially orthogonal to the longitudinal axis LA of thetorque tube beam 150 and is substantially orthogonal to the axis ofrotation R of each of the solar tracker bearing assemblies 200, that is,the direction Y as used herein will be an east-west horizontaldirection.

In one exemplary embodiment, the solar tracker bearing apparatus 200 ofthe present disclosure includes the rotatable bearing assembly 300supported for rotation about the axis of rotation R by the stationarysaddle assembly 400. The solar tracker bearing apparatus 200 furtherincludes the connecting assembly 500 for adjustably securing the saddleassembly 400 to the upper mounting portion 172 of the post 170. In oneexemplary embodiment, the connecting assembly 500 affixes a lowercoupling portion 402 of the saddle assembly 400 to the upper mountingportion 172 of the support post 150.

As best seen in FIGS. 4-6, in one exemplary embodiment, the rotatablebearing assembly 300 includes a central portion 302 and first and secondspaced apart arcuate peripheral portions 320, 340. The central portion302 of the bearing assembly 300 includes a channel 304 defining the beamslot 306 for receiving the torque tube beam 150, The beam slot 306includes spaced apart vertical side walls 308 and the horizontallyextending lower wall 310 for receiving and abutting the lower wall 157and the horizontally extending upper wall 314 abutting the upper wall156 of the square cross sectional shape of the torque tube beam 150. Thefirst peripheral portion 320 of the bearing assembly 300 includes afirst arcuate rim bearing 322 and the second peripheral portion 340includes a second arcuate rim bearing 342. The first and second rimbearings 322, 342 are spaced apart as viewed in an axial direction, thatis, as measured or viewed along the axis of rotation R of the rotatablebearing assembly 300 (stated another way, spaced apart as measured inthe horizontal direction X) and are centered about the axis of rotationR. Further, the first and second rim bearings 322, 342, as viewed withrespect to the axis of rotation R, have the same radius or radius ofcurvature RC (shown schematically in FIG. 8), that is, the first andsecond rim bearings 322, 342 would lie on the surface of a right angleor right cylinder extending along and centered about the axis ofrotation R and having a radius RC. To facilitate a flush fit between theportion 151 of the torque tube beam 150 received in the beam slot 306and, specifically, to facilitate a flush fit between side walls 158 ofthe torque tube beam portion 151 and the opposing side walls 308 of thebeam slot 306 and between the lower wall 157 of the torque tube beamportion 151 and the bottom wall 310 of the beam slot 306 and tofacilitate ease of removal of the torque tube beam portion 151 from thebeam slot 306, there are double radius recesses 312 forming the cornertransitions between the opposing side walls 308 and the bottom wall 310of the beam slot 306.

In one exemplary embodiment, the stationary saddle assembly 400 includesthe lower coupling portion 402, adapted to be affixed to the connectingassembly 500, and an upper bearing portion 410, for pivoting support ofthe rotatable bearing assembly 300. The upper support portion 410 of thesaddle assembly 400 includes a first arcuate slot 420 and a secondarcuate slot 440. The first arcuate slot 420 includes a first arcuatebearing race 422 and the second arcuate slot 440 includes a secondarcuate bearing race 442. The first and second arcuate bearing races422, 442 are spaced apart as viewed in an axial direction, that is, asmeasured or viewed along the axis of rotation R of the rotatable bearingassembly 300 (stated another way, spaced apart as measured in thehorizontal direction X) and are centered about the axis of rotation R.Further, the first and second arcuate bearing races 422, 442, as viewedwith respect to the axis of rotation R, have the same radius or radiusof curvature RC as the first and second rim bearings 322, 342. That is,the first and second arcuate bearing races 422, 442 would lie on thesurface of a right cylinder extending along and centered about the axisof rotation R and having a radius RC. The first arcuate bearing race 422slidably supports the first arcuate rim bearing 322 of the rotatablebearing assembly 300 and the second arcuate bearing race 442 slidablysupports the second arcuate rim bearing 342 of the rotatable bearingassembly 300 such that the arcuate or pivoting movement of the rotatablebearing assembly 300 is centered about the axis of rotation R.

As best seen in FIG. 5, in one exemplary embodiment, the rotatablebearing assembly 300 and the stationary saddle assembly 400 of the solartracker bearing apparatus 200 are both two part assemblies that aresymmetric about a central vertical plane CVP (FIGS. 3, 6 and 7)extending through the solar tracker bearing apparatus 200. The centralvertical plane CVP of the solar tracker bearing apparatus 200 isparallel to and aligned with the central vertical axis PCVA of thesupport post 170 and extends orthogonally to and is intersected by theaxis of rotation R of the rotatable bearing assembly 300, that is, thecentral vertical plane CVP of the solar tracker bearing apparatus 200extends in the vertical direction V. The central vertical plane CVP ofthe solar tracker bearing apparatus 200 includes a vertical center lineVCL (FIGS. 6 and 7) of the apparatus 200 that intersects and isorthogonal to the axis of rotation R of the rotatable bearing assembly300. In one exemplary embodiment, the rotatable bearing assembly 300includes first and second bearing members 350, 370 and the saddleassembly 400 includes first and second saddle members 450, 470. Becausethe first and second bearing members 350, 370 are symmetrical about thecentral vertical plane CVP, advantageously, the members 350, 370 areidentical, leading to significant efficiencies in the manufacture of therotatable bearing assembly 300 and reducing inventory requirements.Similarly, because the first and second saddle members 450, 470 aresymmetrical about the central vertical plane CVP, advantageously, themembers 450, 470 are identical, leading to significant efficiencies inthe manufacture of the saddle assembly 300 and reducing inventoryrequirements.

Rotatable Bearing Assembly 300

The first bearing member 350 of the rotatable bearing assembly 300 isgenerally semicircular including a generally planar central region 352and a laterally extending peripheral rim 354. The planar central region352 is substantially parallel to but spaced laterally from the centralvertical plane CVP of the solar tracker bearing apparatus 200. Thecentral region 352 includes a generally U-shaped cut-out 356. Extendinglaterally from the planar central region 352 adjacent the U-shaped cutout 356 are a pair of projections 358. The pair of projections 358extend laterally from the central portion in a direction opposite theperipheral rim 354 and form a portion of the U-shaped cut out 356.Similarly, the second bearing member 370 is generally semicircularincluding a generally planar central region 372 and a laterallyextending peripheral rim 374. The planar central region 372 issubstantially parallel to but spaced laterally from the central verticalplane CVP of the solar tracker bearing apparatus 200. The central region372 includes a generally U-shaped cut-out 376. Extending laterally fromthe planar central region 352 adjacent the U-shaped cut-out 376 are apair of projections 378. The pair of projections 378 extend laterallyfrom the central portion in a direction opposite the peripheral rim 374and form a portion of the U-shaped cut-out 376.

The central portion 302 of the rotatable bearing assembly 300 is definedby the spaced apart planar central regions 352, 372, along with thepairs of projections 358, 378, of the first and second bearing members350, 370. The beam slot 306 of the rotatable bearing assembly 300receives and supports the torque tube beam 150 is defined by theU-shaped cut-outs 356, 376 of the first and second bearing members 350,370. Advantageously, because of the respective pairs of projections 358,378 extend laterally from the central portions 352, 372 and, thus,function to space apart the central portions 352, 372 of the first andsecond bearing members 350, 370, an axial extent of the beam slot 306,that is, an extent of the beam slot 306 as measured with respect to theaxis of rotation R (or as measured along the horizontal direction X) islarge. This advantageously provides for increased area of support andthus increased stability in support of the torque tube beam 150 as it isreceived in the beam slot 306 and is pivotally supported by the bearingassembly 300. The generally U-shaped hold down bracket 390 is disposedbetween respective upper portions 353, 373 of the central regions 352,372 of the first and second bearing members 350, 370. The hold downbracket 390 functions to both secure a portion 151 of the torque tubebeam 150 disposed within the beam slot 306 and laterally space apart thecentral portions 352, 372 of the first and second bearing members 350,370. The torque tube beam 150 is confined from movement within the beamslot 306 by beam slot bottom wall 310, a pair of beam slot side walls308 and the upper wall 314 defined by the lower or bottom wall or end392 of the hold down bracket 390.

The first and second bearing members 350, 370 are secured via fourfasteners 394 that extend in the direction X though aligned apertures ofthe first and second bearing members 350, 370 and aligned horizontalapertures in the hold down bracket 390 which functions to laterallyspace apart the first and second bearing members 350, 370. It should beunderstood, of course, that if a shim 396 is utilized and the positionof the torque tube beam 150 within the beam slot 306 is raised, adifferent configuration of the hold down bracket 390 will have to beutilized to abut the upper wall 156 of the torque tube beam 150 andstill allow the aligned apertures of the hold down bracket 390 toreceive the four fasteners 394 that extend though the hold down bracket390 and the aligned apertures of the first and second bearing members350, 370. The pair of projections 358, 378 also function to laterallyspace the first and second bearing members 350, 370 and horizontalsurfaces of the projections 358, 378 form portions of the bottom wall310 of the beam slot 306. Facing surfaces 357, 377 of the respectivepairs of projections 358, 378 abut and function to space apart therespective planar central regions 352, 372. The facing surfaces 359, 379of the respective pairs of projections 358, 378 are positioned along andare coincident with the central vertical plane CVP of the solar trackerbearing apparatus 200.

A fifth fastener 395 extends to align apertures of the central portions352, 372 of the first and second bearing members 350, 370 in the regionof the projections 358, 378 to additionally secure the first and secondbearing members 350, 370. Additionally, to the extent a shim 396 is usedto raise the center of mass CM of the table 110, the fifth fastener 395extends through aligned inverted U-shaped recesses or openings 399formed in lower edges of vertically extending legs 398 of the shim 396to affix the shim 396 to the first and second bearing members 350, 370such that the horizontal central portion 397 is disposed against andoverlies the bottom wall 310 of the beam slot 306. The upper surface 397a of the horizontal central portion 397 of the shim 396 in the beam slot306 bears against the lower wall 157 of the torque tube beam 150 andthereby raises the torque tube beam 150 in the vertical direction V by athickness T (FIG. 15) of the horizontal central portion 397 of the shim396 and thus raises the center of mass CM of the table 110 by the samethickness T of the horizontal central portion 397 of the shim 396. Inone exemplary embodiment, the fasteners 394, 395, as well as otherfasteners referred to below, may be two-part threaded fastenersincluding a threaded bolt and threaded nut combination wherein the headof the bolt includes a hex drive socket for driving by a hex driver. Aswould be recognized by one of skill in the art, other types of fastenersmay be utilized instead of or in combination with the two-part threadedfasteners shown in the drawings.

The laterally extending peripheral rim 354 defines the first arcuate rimbearing 322 of the first peripheral portion 320 of the bearing assembly300, while the laterally extending peripheral rim 374 defines the secondarcuate rim bearing 342 of the second peripheral portion 340 of thebearing assembly 300. Advantageously, since the peripherally rims 354,374 extend away from the respective central regions 352, 372 of thefirst and second bearing members 250, 370, an axial distance, that is, adistance as measured along the axis of rotation R, between the first andsecond arcuate rim bearings 322, 342 is large. This large axial distancebetween bearing engagement surfaces of the rim bearings 322, 342 of thebearing assembly 300 and the bearing engagement surfaces of the firstand second bearing races 422, 442 of the saddle assembly 400advantageously provides for improved bearing support and improvedstability for the bearing assembly 300 as it rotates with respect to thesaddle assembly 400 about the axis of rotation R. In one exemplaryembodiment, as measured with respect to the axis of rotation R, theangular or arcuate extent of the first and second rim bearings 322, 342is approximately 181.75 degrees. If the arcuate extent of the first andsecond rim bearings 322, 342, was exactly 180 degrees, then the axis ofrotation R would pass through a point along an upper end 391 of the holddown bracket 390 and would be centered between the opposing side walls308 of the beam slot 306. Since, in the exemplary embodiment, thearcuate extent of the first and second rim bearings 322, 342 is slightlygreater than 180 degrees, as can best be seen in FIGS. 3 and 8, the axisof rotation R passes through a point somewhat vertically below the upperend 391 of the hold down bracket 390 and would be centered between theopposing side walls 308 of the beam slot 306. If, in another exemplaryembodiment, the arcuate extent of the first and second rim bearings 322,342 is somewhat less than 180 degrees, the axis of rotation R would passthrough a point somewhat vertically above the upper end 391 of the holddown bracket 390 and would be centered between the opposing side walls308 of the beam slot 306. In one exemplary embodiment, as shown, forexample, in FIG. 8, without the use of the shim 396, the axis ofrotation R is approximately 2.99 inches vertically above thelongitudinal axis of the torque tube beam 150 and the same distancevertically above the central axis BSA of the beam slot 306. In oneexemplary embodiment, as measured with respect to the axis of rotationR, the angular or arcuate extent of the first and second bearing races422, 442 of the saddle assembly 400 is approximately 60 degrees.Accordingly, in one exemplary embodiment, the angle of inclination AI ofthe solar tracker bearing apparatus 200 is approximately +/−60 degrees(or 120 degrees of total angular pivot of the table 110).

Saddle Assembly 400

As best seen in FIGS. 3-5 and 10, the saddle assembly 400 includes alower coupling portion 402 and the upper bearing portion 410. As notedabove, the upper bearing portion 410 includes a includes the firstarcuate slot 420 and the second arcuate slot 440. The first arcuate slot420 includes the first arcuate bearing race 422 and the second arcuateslot 440 includes the second arcuate bearing race 442. The first andsecond arcuate bearing races 422, 442 are spaced apart as viewed in anaxial direction, that is, as measured or viewed along the axis ofrotation R of the rotatable bearing assembly 300 (stated another way,spaced apart as measured in the horizontal direction X) and are centeredabout the axis of rotation R. The first arcuate bearing race 422slidably supports the first arcuate rim bearing 322 of the rotatablebearing assembly 300 and the second arcuate bearing race 442 slidablysupports the second arcuate rim bearing 342 of the rotatable bearingassembly 300 such that the arcuate or pivoting movement of the rotatablebearing assembly 300 is centered about the axis of rotation R.

The first arcuate bearing race 422, when viewed in cross section is ahorizontally oriented U-shaped surface 423, with the opening of theU-shaped surface 423 facing toward the vertical center line VCL of thesolar tracker bearing apparatus 200 or, stated another way, facingtoward the central vertical plane CVP of the apparatus 200. The U-shapedsurface 423 of the first arcuate bearing race 422 includes an arcuateinner bearing surface or race 424 and a radially spaced apart arcuateouter bearing surface or race 425, both centered about the axis ofrotation R of the rotatable bearing assembly 300 and the inner arcuatebearing race 424 being closer to the axis of rotation R than the arcuateouter bearing race 425. The inner bearing race 424 providing slidingbearing support for an arcuate inner surface 324 of the first arcuaterim bearing 322 and the outer bearing race 425 providing sliding bearingsupport for an arcuate outer surface 325 of the first arcuate rimbearing 322.

The second arcuate bearing race 442, when viewed in cross section is ahorizontally oriented U-shaped surface 443, with the opening of theU-shaped surface 443 facing toward the vertical center line VCL of thesolar tracker bearing apparatus 200 or, stated another way, facingtoward the central vertical plane CVP of the apparatus 200. The U-shapedsurface 443 of the first arcuate bearing race 442 includes an arcuateinner bearing surface or race 444 and a radially spaced apart arcuateouter bearing surface or race 445, both centered about the axis ofrotation R of the rotatable bearing assembly 300 and the inner arcuatebearing race 444 being closer to the axis of rotation R than the arcuateouter bearing race 445. The inner bearing race 444 providing slidingbearing support for an arcuate inner surface 344 of the second arcuaterim bearing 342 and the outer bearing race 445 providing sliding bearingsupport for an arcuate outer surface 345 of the second arcuate rimbearing 342.

In one exemplary embodiment, the saddle assembly 400 is a two pieceassembly comprising the first and second saddle members 450, 470 whichare identical and symmetric about the central vertical plane CVP of thesolar tracker bearing apparatus 200. The first saddle member 450includes an upper bearing region 460 and a lower support region 452. Thelower support region 452 of the first saddle member 450 includes adownwardly or vertically extending generally planar flange 453. Thevertical planar flange 453 includes a pair of bosses 454 extendinglaterally in a direction away from the central vertical plane CVP of thesolar tracker bearing apparatus 200. Each of the pair of bosses 454includes an upper cylindrical sleeve 455 a and a lower cylindricalsleeve 455 b, each of the sleeves 455 a, 455 b includes a horizontallyextending aperture through the respective sleeves. The lower supportregion 452 of the first saddle member 450 also includes a pair ofprojections 456 extending laterally from the flange 453 in a directiontoward the central vertical plane CVP. The pair of projections 456include apertures that are aligned with the apertures of the uppercylindrical sleeve 455 a, thus, providing a pair of horizontalthroughbores 458 through the lower support region 452 of the firstsaddle member 450.

The second saddle member 470 includes an upper bearing region 480 and alower support region 472. The lower support region 472 of the secondsaddle member 470 includes a downwardly or vertically extendinggenerally planar flange 473, The vertical planar flange 473 includes apair of bosses 474 extending laterally in a direction away from thecentral vertical plane CVP of the solar tracker bearing apparatus 200.Each of the pair of bosses 474 includes an upper cylindrical sleeve 475a and a lower cylindrical sleeve 475 b, each of the sleeves 475 a, 475 bincludes a horizontally extending aperture through the respectivesleeves 475 a, 475 b. The lower support region 472 of the second saddlemember 470 also includes a pair of projections 476 extending laterallyfrom the flange 473 in a direction toward the central vertical planeCVP. The pair of projections 476 include apertures that are aligned withrespective apertures of the upper cylindrical sleeve 475 a of the pairof bosses 474. This alignment of respective apertures provides a pair ofhorizontal throughbores 478 through the lower support region 472 of thesecond saddle member 470.

When the first and second saddle members 450, 470 are assembled, a pairof horizontally extending fasteners 490 extend through the alignedhorizontal throughbores 458, 478 of the respective lower support regions452, 472 of the first and second saddle member 450, 470 to secure thefirst and second saddle members 450, 470 together. Facing surfaces 457,477 of the respective pairs of projections 456, 476 abut and function toaxially space apart the respective planar flanges 453, 473 of the firstand second saddle members 450, 470. The flanges 453, 473 are alsoaxially spaced apart by an inverted U-shaped channel 512 of ahorizontally oriented W brace 510 of the connecting assembly 500. Theinverted U-shaped channel 512 of the horizontally oriented W brace 510,like the flanges 453, 473 of the first and second saddle members 450,470 extend in the horizontal direction Y. The W brace 510 includes apair of vertically oriented outer side walls 520 and a pair ofvertically oriented inner side walls 522. A pair of horizontal fasteners492 extend in the direction X through aligned apertures formed in theouter and inner side walls 520, 522 of the W brace 510 and the aperturesextending through the respective the lower cylindrical sleeves 455 b oflower support region 452 of first saddle member 450 and the lowercylindrical sleeves 475 b of lower support region 472 of second saddlemember 470 to secure the saddle assembly 400 to the W brace 510 andadditionally secure the first and second saddle members 450, 470together. As best seen in FIGS. 8 and 10, the apertures through thelower cylindrical sleeves 455 b, 475 b of the first and second saddlemembers 450, 470 constitute arched or arcuate slots 459, 479. Thearcuate slots 459, 479 are concave with respect to the vertical centerline VCL of the bearing assembly 200. Advantageously, the arcuate slots459, 479 of the first and second saddle members 450, 470 provide for atilt adjustability of the saddle member 400 with respect to the supportpost 170 to account for a misalignment condition referred to as a posttilt condition, as explained below. The lower support regions 452, 472of the first and second saddle member 450, 470, as assembled, comprisethe lower coupling portion 402 of the saddle assembly 400. Additionally,as the W brace 510 is assembled to the saddle assembly 400 and thesaddle assembly 400 rotatably supports the bearing assembly 300, anassembled combination of the W brace 510 of the connecting assembly 500,the saddle assembly 400 and the rotatable bearing assembly 300 will bereferred to as the assembled combination 600.

As best seen in FIGS. 8 and 9, in one exemplary embodiment, the upperbearing region 460 of the first saddle member 450 includes an arcuatebody 462 which is generally rectangular in cross section including aninner wall 462 a, an axially spaced apart outer wall 462 b, an uppersurface 462 c and a radially spaced apart lower surface 462 d. Byradially spaced apart it is meant that the upper and lower surfaces 460c, 460 d are spaced apart as measured along a radius line extendingvertically downwardly from the axis of rotation R of the bearingapparatus 200, with the upper surface 460 c being closer to the axis ofrotation R. The upper surface 460 c of the arcuate body 462 includes aJ-shaped opening 463, as viewed in cross section FIG. 9). An interiorregion 464 of the J-shaped opening 463 defines a U-shaped slot 465. Alow friction, durable U-shaped insert 466 is fixedly positioned in theU-shaped slot 465. The low friction insert 466 includes a U-shaped slot467, as viewed in cross section. The U-shaped slot 467 of the insert 466defines the U-shaped surface 423 and the inner and outer bearing races424, 425 of the first bearing race 422 which slidingly receives thefirst arcuate rim bearing 322 of the first peripheral portion 320 of therotatable bearing assembly 300. Stated another way, the U-shaped slot467 of the insert 466 defines a first journal bearing race 468,comprising the first bearing race 422 of the upper bearing portion 410of the saddle assembly 400 and the U-shaped slot 467 of the insert 466defines the first arcuate slot 420 of the upper bearing portion 410 ofthe saddle assembly 400.

In one exemplary embodiment, the insert 466 is fabricated of a polymersuch as acetal or polymer with glass or another filler or other materialexhibits similar properties and/or characteristics. By way of exampleand without limitation, in one exemplary embodiment, the insert 466 isfabricated a polyoxymethylene thermoplastic polymer exhibiting highstiffness, low friction, dimensional stability and excellent wear andabrasion resistance or other material exhibiting similarcharacteristics. One commercially available polyoxymethylenethermoplastic polymer is Delrin® polymer available from E.I. DuPontDeNemours and Company, Wilmington, Del. It should be understood, ofcourse, that the insert 466, while desirable, is optional, and the firstbearing race 422 could be defined by the U-shaped slot 465 of thearcuate body 462, depending on the loading forces applied to the firstbearing race 422, the material(s) that the arcuate body 462 isfabricated of and/or coatings applied to the arcuate body 462 in theregion of the U-shaped slot 465, the durability desired and thecoefficient of sliding friction desired for the first bearing race 422,among other factors.

Similarly, in one exemplary embodiment, the upper bearing region 480 ofthe second saddle member 470 includes an arcuate body 482 which isgenerally rectangular in cross section including an inner wall 482 a, anaxially spaced apart outer wall 482 b, an upper surface 482 c and aradially spaced apart lower surface 482 d. The upper surface 480 c ofthe arcuate body 482 includes a J-shaped opening 483, as viewed in crosssection. An interior region 484 of the J-shaped opening 483 defines aU-shaped slot 485. A low friction, durable U-shaped insert 486 isfixedly positioned in the U-shaped slot 485. The low friction insert 486includes a U-shaped slot 487, as viewed in cross section. The U-shapedslot 487 of the insert 486 defines the U-shaped surface 443 and theinner and outer bearing races 444, 445 of the first second race 442which slidingly receives the second arcuate rim bearing 342 of thesecond peripheral portion 340 of the rotatable bearing assembly 300.Stated another way, the U-shaped slot 487 of the insert 486 defines asecond journal bearing race 488 comprising the second bearing race 442of the upper bearing portion 410 of the saddle assembly 400 and theU-shaped slot 487 of the insert 486 defines second arcuate slot 440 ofthe upper bearing portion 410 of the saddle assembly 400. As explainedabove with respect to the insert 466, it should be understood that theinsert 486, while desirable, is optional, and the second bearing race442 could be defined by the U-shaped slot 485 of the arcuate body 482,depending on the loading forces applied to the second bearing race 442,the material(s) that the arcuate body 483 is fabricated of and/orcoatings applied to the arcuate body 483 in the region of the U-shapedslot 485, the durability desired and the coefficient of sliding frictiondesired for the second bearing race 442, among other factors.

Connecting Assembly 500

As best seen in FIGS. 3-5, 7-9 and 11-13, the connecting assembly 500functions to couple the saddle assembly 400 of the solar tracker bearingapparatus 200 to the upper mounting portion 172 of the upright supportpost 170. The connecting assembly 500 includes the W brace 510, a postcap 540 which is affixed to the upper mounting portion 172 of thesupport post 150, and a stiffener member 560, which is interposedbetween the post cap 540 and an upper end 178 of the support post 150and provides additional structural rigidity to the connecting assembly500.

Advantageously, as mentioned previously, the connecting assembly 500,along with the lower coupling portion 402 of the saddle assembly 400,allows for adjustability in the mounting of the solar tracker bearingapparatus 200 to the upper mounting portion 172 of the support post 150to account for the fact that given the terrain that the support posts170 are installed, there are often various types of misalignmentproblems that must be accounted for in attempting to properly andprecisely align, orient and position the beam slot 306 of the rotatablebearing assembly 300 of a given solar tracker bearing apparatus 200 toreceive the torque tube beam 150. Misalignment problems between thesupport post 170 and the torque tube beam 150 can take various formsincluding: a) Post twist the side walls 170 of the support post 170which include the pair of vertically extending slots 176 are not inalignment with the longitudinal axis LA of the torque tube beam 150.Thus, if the solar tracker bearing apparatus 200 were mounted to thesupport post side walls 170 with post twist adjustability, the axis ofrotation R of the rotatable bearing assembly 300 of the solar trackerbearing apparatus 200 would not be parallel with the torque tube beamlongitudinal axis LA. Such post twist condition would cause additionalundesirable forces applied to both the rotatable bearing assembly 300,the saddle assembly 400 and the torque tube beam 150. b) Y directionmisalignment—the vertical center line PCVA of the post 150 is orthogonalto but offset from the torque tube beam longitudinal axis LA. Such a Ydirection misalignment condition would cause difficulty in positioningthe torque tube beam 150 in the beam slot 306 and/or mounting theconnecting assembly 500 to the post mounting portion 172. c) Posttilt—the vertical center line CLP of the post intersects the torque tubebeam longitudinal axis LA but is not orthogonal to the longitudinalaxis. Such a post tilt condition would again cause difficulty inpositioning the torque tube beam 150 in the beam slot 306 and/ormounting the connecting assembly 500 to the post mounting portion 172.

Advantageously, the connecting assembly 500, along with the lowercoupling portion 402 of the saddle assembly 400, provide the necessarydegrees of freedom or degrees of adjustability to account for posttwist, Y direction misalignment, and post tilt conditions.

As noted previously and as best seen in FIGS. 4-5, 8-9 and 11, the Wbrace 510 includes the pair of vertically oriented outer or side walls520 and the pair of vertically oriented inner walls 522. The outer andinner walls 520, 522 are spaced apart or separated, as measured axially(that is, as measured along the axis of rotation R or the direction X),by a central upper wall 524 and a pair of flanking lower walls 526. Thisarrangement results in a three channel configuration for the W brace510. The channels of the W brace 510 include: a) the inverted U-shapedchannel 512 that spaces the flanges 453, 473 of the lower supportregions 452, 472 of the first and second saddle members 450, 470; b) anupright channel 514 which receives the lower cylindrical sleeves 455 bof lower support region 452 of first saddle member 450; and c) anupright channel 516 which receives lower cylindrical sleeves 475 b oflower support region 472 of second saddle member 470. The pair ofhorizontal fasteners 492 extend in the direction X through alignedapertures formed in the outer and inner side walls 520, 522 of the Wbrace 510 and the apertures extending through the respective the lowercylindrical sleeves 455 b of lower support region 452 of first saddlemember 450 and the lower cylindrical sleeves 475 b of lower supportregion 472 of second saddle member 470 to secure the saddle assembly 400to the W brace 510 of the connecting assembly 400. Advantageously, theapertures through the lower cylindrical sleeves 455 b, 475 b of thefirst and second saddle members 450, 470 constitute arched or arcuateslots 459, 479. The arcuate slots 459 provide for tilt adjustability ofthe solar tracker bearing apparatus 200 with respect to the center linePCVA though the support post 170 and, thus provides for adjustability toaccount for a post tilt condition. In one exemplary embodiment, thearcuate extent of the arcuate slots 459, 479 is sufficient to allow for+/−2° of tilt adjustability with respect to the post 150 in thedirection X.

As best seen in FIGS. 5, 8-9 and 12, the post cap 540 includes a centralhorizontal planar section or horizontal upper wall 542 that isrectangular in shape and pair of vertically downwardly extending sidewalls 550, 552 extending from opposite sides 544 a, 544 b of thehorizontal upper wall 542 of the post cap 540. The vertical side walls550, 552 are parallel and extend in the direction X, that is, parallelto the rotatable bearing assembly axis of rotation R and parallel to thetorque tube beam longitudinal axis LA. The remaining opposite two sides544 c, 544 d of the horizontal upper wall 542 of the post cap 540 areopen, that is, there are no side walls extending from sides 544 c, 544d, The horizontal upper wall 542 and side walls 550, 552 of the post cap540 define and inverted U-shaped opening 554. Each of the downwardlyextending side walls 550 includes an array of four spaced apartapertures 556. Eight horizontally extending fasteners 559 extend in thedirection Y (orthogonal to the axis of rotation R) through each of thefour apertures 556 and through the aligned vertically extending slots176 in the side walls 174 of the upper mounting portion 172 of thesupport post 150 to secure the connecting assembly 500 to the supportpost 150 and thereby mount the solar tracker bearing apparatus 200 tothe support post 150. Advantageously, the fact that the mounting slots176 of the support post 150 extend vertically allows for a range ofheight adjustment of the solar tracker bearing apparatus 200 withrespect to an upper end 178 of the support post 170. That is, the heightadjustment of the post cap 540 allows a vertical position of therotatable bearing assembly 300 to be adjusted in the vertical directionV with respect to the upper end 178 of the support post 150 such thatthe torque tube beam 150 fits snugly in the beam slot 306.

As best seen in FIGS. 5, 7-9 and 13, the stiffener member 560 isattached to the post cap 540 and is interposed between the post cap 540and the upper end 170 of the support post 150 and functions to increasestructural rigidity of the connecting assembly 500. The stiffener member560 includes a central horizontal planar section or horizontal upperwall 562 that is rectangular in shape and pair of vertically downwardlyextending side walls 570, 575 extending from opposite sides 564 c, 564 dof the horizontal upper wall 562 of the stiffener member 560. The sidewalls 570, 572 of the stiffener member 560 are parallel and extend inthe horizontal direction Y, that is, perpendicular to the rotatablebearing assembly axis of rotation R and perpendicular to the torque tubebeam longitudinal axis LA. The remaining opposite two sides 564 a, 564 bof the horizontal upper wall 562 of the stiffener member 560 are open,that is, there are no side walls extending from sides 564 a, 564 b. Thehorizontal upper wall 562 and side walls 570, 572 of the stiffenermember 560 define and inverted U-shaped opening 574.

Advantageously, the horizontal upper wall 562 and side walls 570, 572 ofthe stiffener member 560 is sized to be received within the invertedU-shaped opening 554 of the post cap 540. That is, the horizontal upperwall 542 of the post cap overlies and is in planar contact with thehorizontal upper wall 562 of the stiffener member 560. Further, the sidewalls 570, 572 of the stiffener member 570 are orthogonal to the sidewalls 550, 552 of the post cap 540 such that vertical edges 573 of therespective side walls 570, 572 of the stiffener member 560 areorthogonal to and abut the respective side walls 550, 552 of the postcap 540. The side walls 550, 552, 570, 572 of the post cap 540 andstiffener member 560 form a box-like configuration of four orthogonal,vertically extending side walls 550, 552, 570, 572 which advantageouslyfunctions to increase the structural rigidity of the connecting assembly500.

As explained above, the lower coupling portion 402 of the saddleassembly 400 is affixed to the W brace 510 and the post cap 540 isaffixed to the upper mounting portion 172 of the support post 150. TheU-shaped opening 574 of the stiffener member 560 is received on theupper end 178 of the support post 150. The stiffening member 560 is heldrigidly and firmly in place on the upper end 178 of the support post 150by the horizontal upper wall 542 of the post cap 540 which bears againstthe horizontal upper wall 562 of the stiffener member 560 and sandwichesthe stiffener member 560 against the upper end 178 of the support post150 when the post cap 540 is affixed to the side walls 174 of thesupport post 170 via a pair of fasteners. Thus, both the post cap 540and the stiffening member 574 are rigidly and firmly affixed to thesupport post 150.

The horizontal upper walls 542, 562 of the post cap 540 and stiffenermember 560 each include an aligned array of four concentric arcuateopenings or slots. The horizontal upper wall 542 of the post cap 540includes an array four arcuate slots 558. The four arcuate slots 558 aregenerally centered about a vertical center line UWVCL though thehorizontal upper walls 542, 562 of the post cap 540 and stiffener member560. The horizontal upper wall 542 of the stiffener member 560 includesan aligned array of four arcuate slots 578. The four arcuate slots 578are generally centered about or concentric with the vertical center lineUWVCL. The four arcuate slots 558 of the horizontal upper wall 542 ofthe post cap 540 and the four arcuate slots 558 of the horizontal upperwall 562 of the stiffener member 560 are vertically aligned and areconcave with respect to the vertical center line UWVCL. In one exemplaryembodiment, the four arcuate slots 558 are concentric with a centerpoint on the vertical center line UWVCL. Additionally, the pair ofspaced apart lower walls 526 of the W brace 510 each include a pair ofstraight slots 528 forming an array of four straight slots which aregenerally centered about a vertical center line BVCL through the W brace510. The combination of the array of four arcuate slots 558, 578 of thehorizontal upper walls 542, 562 of the post cap 540 and stiffener member560, combined with the array of four straight slots 528 of the lowerwalls 526 of the W brace 510 advantageously allow for: a) limitedrotational adjustability of the W brace 510 and, thus, the saddleassembly 400 and rotational bearing assembly 300, which are affixed tothe W brace 510, with respect to the post cap 540 to account for thepost twist condition; and b) limited linear adjustability of the W brace510 and, thus, the saddle assembly 400 and rotational bearing assembly300, which are affixed to the W brace 510, in the Y direction(orthogonal to the axis of rotation R) to account for Y directionmisalignment condition.

Four vertically extending fasteners 580 extend through the aligned fourstraight slots 528 of the lower walls 526 of the W brace 510, the fourarcuate slots 558 of the horizontal upper wall 542 of the post cap 540and the four arcuate slots 578 of the horizontal upper wall 562 of thestiffener member 560 to secure the assembled combination 600 of the Wbrace 510, the saddle assembly 400 and rotational bearing assembly 300to the post cap 540 and stiffener member 560 and thereby secure theassembled combination 600 to the support post 170. Advantageously,because the overlap of the four straight slots 528 of the lower walls526 of the W brace 510, the four arcuate slots 558 of the horizontalupper wall 542 of the post cap 540 and the four arcuate slots 578 of thehorizontal upper wall 562 of the stiffener member 560, the assembledcombination 600 of the W brace 510, the saddle assembly 400 androtational bearing assembly 300 to the post cap 540 may be rotated aboutthe vertical center line BVCL through the W brace 510. This rotationaladjustability of the W brace 510, the saddle assembly 400 and rotationalbearing assembly 300 account for the post twist condition. In oneexemplary embodiment, the angular range of rotation of the assembledcombination 600 of the W brace 510, the saddle assembly 400 and therotational bearing assembly 300 about the vertical center line BVCL isapproximately +/−8 degrees.

Additionally, because of the aligned four straight slots 528 of thelower walls 526 of the W brace 510, advantageously, the assembledcombination 600 of the W brace 510, the saddle assembly 400 and therotational bearing assembly 300 have limited travel or adjustabilitypermitted in the direction Y (orthogonal to the axis of rotation R).This linear adjustability of the assembled combination 600 of the Wbrace 510, saddle assembly 400 and rotational bearing assembly 300 inthe direction Y accounts for the Y direction misalignment condition. Inone exemplary embodiment, the linear adjustability along the direction Yresulting from the four straight slots 528 of the lower walls 526 of theW brace 510 is +/−0.75 in.

In one exemplary embodiment, the first and second bearing members 350,370 of the rotatable bearing assembly 300 and the first and secondsaddle members 450, 470 of the saddle assembly 400 are fabricated ofcast aluminum. The first and second bearing members 350, 370 and firstand second saddle members 450, 470 could also be made of other materialshaving similar characteristics or properties including but not limitedto cast steel, machined aluminum, machined steel and molded polymer. Inone exemplary embodiment, the components of the connecting assembly 500are made of steel, but could also be made of aluminum or a polymer orfilled or reinforced polymer.

As used herein, terms of orientation and/or direction such as upward,downward, forward, rearward, upper, lower, inward, outward, inwardly,outwardly, horizontal, horizontally, vertical, vertically, distal,proximal, axially, radially, etc., are provided for convenience purposesand relate generally to the orientation shown in the Figures and/ordiscussed in the Detailed Description. Such orientation/direction termsare not intended to limit the scope of the present disclosure, thisapplication and the invention or inventions described therein, or theclaims appended hereto.

What have been described above are examples of the presentdisclosure/invention. It is, of course, not possible to describe everyconceivable combination of components, assemblies, or methodologies forpurposes of describing the present disclosure/invention, but one ofordinary skill in the art will recognize that many further combinationsand permutations of the present disclosure/invention are possible.Accordingly, the present disclosure/invention is intended to embrace allsuch alterations, modifications, and variations that fall within thespirit and scope of the appended claims.

What is claimed is:
 1. A solar tracker bearing apparatus mountable to asupport post for pivotally supporting a torque tube beam of a solartracker assembly, the solar tracker bearing apparatus comprising: arotatable bearing assembly supported for rotation about an axis ofrotation by a saddle assembly, the rotatable bearing assembly includinga first bearing member and a second bearing member, the first bearingmember including a central portion and a first arcuate peripheralportion and the second bearing member including a central portion and asecond arcuate peripheral portion, the central portion of the firstbearing member and the central portion of the second bearing memberdefining a torque tube beam slot, the first arcuate peripheral portionof the first bearing member including a first arcuate rim bearing andthe second arcuate peripheral portion of the second bearing memberincluding a second arcuate rim bearing, the first and second rimbearings being spaced apart in a direction parallel to the axis ofrotation of the rotatable bearing assembly, the first bearing memberincluding a first projection extending in a direction toward the secondbearing member and the second bearing member including a secondprojection extending in a direction toward the first bearing member, thefirst and second projections of the first and second bearing membersspacing the first and second bearing members apart and forming part ofthe torque tube beam slot of the rotatable bearing assembly; and thesaddle assembly including a lower coupling portion and an upper bearingportion, the upper bearing portion including a first arcuate bearingrace and a spaced apart second arcuate bearing race, the first andsecond arcuate bearing races being spaced apart in a direction parallelto the axis of rotation of the rotatable bearing assembly, the firstarcuate bearing race slidably supporting the first arcuate rim bearingof the rotatable bearing assembly and the second arcuate bearing raceslidably supporting the second arcuate rim bearing of the rotatablebearing assembly.
 2. The solar tracker bearing apparatus of claim 1further including a connecting assembly affixed to the lower couplingportion of the saddle assembly including a bracket secured to thecoupling portion of the saddle assembly, a post cap having a centralplanar section and a pair of vertically extending sides and a stiffenermember having a central planar section having a pair of verticallyextending sides, the central planar section of the post cap overlyingthe central planar section of the stiffener member such that the pair ofvertically extending sides of the post cap are orthogonal to the pair ofvertically extending sides of the stiffener.
 3. The solar trackerbearing apparatus of claim 2 wherein the central planar section of thepost cap includes an array of four arcuate slots and the central planarsection of the stiffener member includes an array of four arcuate slots,the array of four arcuate slots of the central planar section of thepost cap being aligned with the array of four arcuate slots of thestiffener member.
 4. The solar tracker bearing apparatus of claim 3wherein the bracket includes a central upper wall and first and secondvertical side walls extending from the central upper wall formingcentral inverted U-shaped channel and first and second lower wallsextending from respective ones of the first and second vertical sidewalls, the first and second lower walls including an array of four slotsaligned with the array of four arcuate slots of the central planarsection of the post cap and the array of four arcuate slots of thestiffener member.
 5. The solar tracker bearing assembly of claim 4wherein the lower coupling portion of the saddle assembly includes apair of arcuate slots extending through the lower coupling portion andthe bracket includes aligned apertures through the first and secondvertical side walls, a pair of fasteners extend though the respectivearcuate slots of the lower coupling portion and an aligned pair ofapertures through the first and second vertical side walls of thebracket such that the saddle assembly has tilt adjustability withrespect to the bracket.
 6. The solar tracker bearing apparatus of claim1 wherein the first projection of the first bearing member and thesecond projection of the second bearing member extend parallel to theaxis of rotation of the rotatable bearing assembly, facing surfaces ofthe projections of the first bearing member and the second bearingmember abutting to space apart the central regions of the first andsecond bearing members.
 7. The solar tracker bearing apparatus of claim6 wherein the central region of the first bearing member includes a cutout adjacent the first projection and the central region of the secondbearing member includes a cut out adjacent the second projection, thecut out of the first bearing member and the cut out of the secondbearing member and the projection of the first bearing member and theprojection of the second bearing member being part of the torque tubebeam slot of the rotatable bearing assembly.
 8. The solar trackerbearing apparatus of claim 6 wherein the first arcuate bearing race ofthe upper bearing portion of the saddle assembly includes an innerbearing race and a radially spaced apart outer bearing race, the innerbearing race providing sliding bearing support for an inner surface ofthe first rim bearing and the outer bearing race providing slidingbearing support for an outer surface of the first rim bearing and thesecond arcuate bearing race of the upper bearing portion of the saddleassembly includes an inner bearing race and a radially spaced apartouter bearing race, the inner bearing race providing sliding bearingsupport for an inner surface of the second rim bearing and the outerbearing race providing sliding bearing support for an outer surface ofthe second rim bearing.
 9. The solar tracker bearing assembly of claim 8wherein the saddle assembly including a first saddle member and a secondsaddle member affixed to the first saddle member, the first saddlemember including an upper bearing region including the first arcuatebearing race and a lower support region, the lower support regionincluding a projection extending in a direction parallel to the axis ofrotation of the rotatable bearing assembly toward the second saddlemember and the second saddle member including an upper bearing regionincluding the second arcuate bearing race and a lower support region,the lower support region including a projection extending in a directionparallel to the axis of rotation of the rotatable bearing assemblytoward the first saddle member, facing surfaces of the projections ofthe first saddle member and the second saddle member abutting to spaceapart the first and second arcuate bearing races.
 10. The solar trackerbearing assembly of claim 9 wherein the projection of the first saddlemember includes a first projection extending from a flange of the lowersupport region and a spaced apart second projection extending from theflange of the lower support region and the second saddle member includesa first projection extending from a flange of the lower support regionand a spaced apart second projection extending from the flange of thelower support region, the flange of the lower support region of thefirst saddle member includes a first boss and a second boss, the firstboss includes a first arcuate slot extending through the boss in adirection parallel to the axis of rotation of the rotatable bearingassembly and the second boss including a second arcuate slot extendingthrough the boss in a direction parallel to the axis of rotation of therotatable bearing assembly and the flange of the lower support region ofthe second saddle member includes a first boss and a second boss, thefirst boss includes a first arcuate slot extending through the boss in adirection parallel to the axis of rotation of the rotatable bearingassembly and the second boss including a second arcuate slot extendingthrough the boss in a direction parallel to the axis of rotation of therotatable bearing assembly, the first arcuate slot of the first boss ofthe first saddle member being aligned with the first arcuate slot of thefirst boss of the second saddle member and the second arcuate slot ofthe second boss of the first saddle member being aligned with the secondarcuate slot of the first boss of the second saddle member and a pair offasteners extending though the respective first and second arcuate slotsof the first and second saddle members and an aligned pair of aperturesthrough vertical side walls of the bracket such that the saddle assemblyhas tilt adjustability with respect to the bracket.
 11. The solartracker bearing apparatus of claim 9 wherein the first arcuate bearingrace of the upper bearing region of the first saddle member of thesaddle assembly is defined by a first arcuate insert disposed in a firstarcuate slot of the upper bearing region of the first saddle member andthe second arcuate bearing race of the upper bearing region of thesecond saddle member of the saddle assembly is defined by a secondarcuate insert disposed in a second arcuate slot of the upper bearingregion of the first saddle member.
 12. The solar tracker bearingapparatus of claim 1 wherein the first arcuate bearing race of the upperbearing portion of the saddle assembly is defined by a first arcuateinsert disposed in a first arcuate slot of the upper bearing portion ofthe saddle assembly and the second arcuate bearing race of the upperbearing portion of the saddle assembly is defined by a second arcuateinsert disposed in a second arcuate slot of the upper bearing portion ofthe saddle assembly.
 13. The solar tracker bearing apparatus of claim 1wherein a shim is positioned in the torque tube beam slot adjacent abottom wall of the torque tube beam slot to adjust a vertical positionof a torque tube beam in the torque tube beam slot.
 14. The solartracker bearing apparatus of claim 1 wherein the beam slot is defined bywalls defining a perimeter of the beam slot and includes a central axisextending through the beam slot in direction parallel to the axis ofrotation of the rotatable bearing assembly and the axis of rotation ofthe rotatable bearing assembly is spaced from the central axis of thebeam slot.
 15. The solar tracker bearing apparatus of claim 1 whereinthe axis of rotation of the rotatable bearing assembly is outside of thebeam slot.
 16. A solar tracker bearing apparatus mountable to an uprightsupport post for pivotally supporting a torque tube beam of a solartracker assembly, the solar tracker bearing apparatus comprising: arotatable bearing assembly supported for rotation about an axis ofrotation by a saddle assembly, the rotatable bearing assembly includinga torque tube beam slot and a first bearing member and a second bearingmember affixed to the first bearing member, the first bearing memberincluding a central region and a laterally extending peripheral rim andthe second bearing member including a central region and a laterallyextending peripheral rim, the laterally extending peripheral rim of thefirst bearing member including a first arcuate rim bearing and thelaterally extending peripheral rim of the second bearing memberincluding a second arcuate rim bearing, the first and second rimbearings being spaced apart in a direction parallel to the axis ofrotation of the rotatable bearing assembly, the central region of thefirst bearing member including a cut out in an upper portion of thecentral region and a projection adjacent the cut out extending in adirection parallel to the axis of rotation of the rotatable bearingassembly toward the second bearing member, the central region of thesecond bearing member including a cut out in an upper portion of thecentral region and a projection adjacent the cut out and extending in adirection parallel to the axis of rotation of the rotatable bearingassembly toward the first bearing member, facing surfaces of theprojections of the first bearing member and the second bearing memberabutting to space apart the central regions of the first and secondbearing members and the cut out of the first bearing member and the cutout of the second bearing member and the projection of the first bearingmember and the projection of the second bearing member being part of thetorque tube beam slot of the rotatable bearing assembly; and the saddleassembly including a lower coupling portion and an upper bearingportion, the upper bearing portion including a first arcuate bearingrace and a spaced apart second arcuate bearing race, the first andsecond arcuate bearing races being spaced apart in a direction parallelto the axis of rotation of the rotatable bearing assembly, the firstarcuate bearing race slidably supporting the first arcuate rim bearingof the first bearing member of the rotatable bearing assembly and thesecond arcuate bearing race slidably supporting the second arcuate rimbearing of the second bearing member of the rotatable bearing assembly.17. The solar tracker bearing apparatus of claim 16 further including aconnecting assembly affixed to the lower coupling portion of the saddleassembly including a bracket secured to the coupling portion of thesaddle assembly, a post cap having a central planar section and a pairof vertically extending sides and a stiffener member having a centralplanar section having a pair of vertically extending sides, the centralplanar section of the post cap overlying the central planar section ofthe stiffener member such that the pair of vertically extending sides ofthe post cap are orthogonal to the pair of vertically extending sides ofthe stiffener.
 18. The solar tracker bearing apparatus of claim 17wherein the central planar section of the post cap includes an array offour arcuate slots and the central planar section of the stiffenermember includes an array of four arcuate slots, the array of fourarcuate slots of the central planar section of the post cap beingaligned with the array of four arcuate slots of the stiffener member.19. The solar tracker bearing apparatus of claim 18 wherein the bracketincludes a central upper wall and first and second vertical side wallsextending from the central upper wall forming central inverted U-shapedchannel and first and second lower walls extending from respective onesof the first and second vertical side walls, the first and second lowerwalls including an array of four slots aligned with the array of fourarcuate slots of the central planar section of the post cap and thearray of four arcuate slots of the stiffener member.
 20. The solartracker bearing assembly of claim 19 wherein the lower coupling portionof the saddle assembly includes a pair of arcuate slots extendingthrough the lower coupling portion and the bracket includes alignedapertures through the first and second vertical side walls, a pair offasteners extend though the respective arcuate slots of the lowercoupling portion and an aligned pair of apertures through the first andsecond vertical side walls of the bracket such that the saddle assemblyhas tilt adjustability with respect to the bracket.
 21. The solartracker bearing apparatus of claim 16 wherein the saddle assemblyincluding a first saddle member and a second saddle member affixed tothe first saddle member, the first saddle member including an upperbearing region including the first arcuate bearing race and a lowersupport region, the lower support region including a projectionextending in a direction parallel to the axis of rotation of therotatable bearing assembly toward the second saddle member and thesecond saddle member including an upper bearing region including thesecond arcuate bearing race and a lower support region, the lowersupport region including a projection extending in a direction parallelto the axis of rotation of the rotatable bearing assembly toward thefirst saddle member, facing surfaces of the projections of the firstsaddle member and the second saddle member abutting to space apart thefirst and second arcuate bearing races.
 22. The solar tracker bearingapparatus of claim 16 wherein a shim is positioned in the torque tubebeam slot adjacent a bottom wall of the torque tube beam slot to adjusta vertical position of a torque tube beam in the torque tube beam slot.23. The solar tracker bearing apparatus of claim 16 wherein the torquetube beam slot is defined by a wall defining a perimeter of the beamslot and includes a central axis extending through the beam slot indirection parallel to the axis of rotation of the rotatable bearingassembly and the axis of rotation of the rotatable bearing assembly isspaced from the central axis of the torque tube beam slot.
 24. The solartracker bearing apparatus of claim 16 wherein the axis of rotation ofthe rotatable bearing assembly is outside of the torque tube beam slot.25. A solar tracker bearing apparatus mountable to a support post forpivotally supporting a torque tube beam of a solar tracker assembly, thesolar tracker bearing apparatus comprising: a rotatable bearing assemblysupported for rotation about an axis of rotation by a saddle assembly,the rotatable bearing assembly including a first bearing member and asecond bearing member, the first bearing member including a centralportion and a first arcuate peripheral portion and the second bearingmember including a central portion and a second arcuate peripheralportion, the central portion of the first bearing member and the centralportion of the second bearing member defining a torque tube beam slot,the first arcuate peripheral portion of the first bearing memberincluding a first arcuate rim bearing and the second arcuate peripheralportion of the second bearing member including a second arcuate rimbearing, the first and second rim bearings being spaced apart in adirection parallel to the axis of rotation of the rotatable bearingassembly, at least one of the first bearing member and the secondbearing member including a first projection extending in a directiontoward the other of the first bearing member and the second bearingmember, the first projection spacing the first and second bearingmembers apart in a direction parallel to the axis of rotation andforming part of the torque tube being slot of the rotatable bearingassembly; and the saddle assembly including a lower coupling portion andan upper bearing portion, the upper bearing portion including a firstarcuate bearing race and a spaced apart second arcuate bearing race, thefirst arcuate bearing race slidably supporting the first arcuate rimbearing of the rotatable bearing assembly and the second arcuate bearingrace slidably supporting the second arcuate rim bearing of the rotatablebearing assembly.
 26. The solar tracker bearing apparatus of claim 25further including a connecting assembly affixed to the lower couplingportion of the saddle assembly including a bracket secured to the lowercoupling portion of the saddle assembly, a post cap having a centralplanar section and a pair of vertically extending sides and a stiffenermember having a central planar section having a pair of verticallyextending sides, the central planar section of the post cap overlyingthe central planar section of the stiffener member such that the pair ofvertically extending sides of the post cap are orthogonal to the pair ofvertically extending sides of the stiffener.
 27. The solar trackerbearing assembly of claim 25 wherein the first bearing member includesthe first projection and the second bearing member includes a secondprojection, wherein the first projection of the first bearing member andthe second projection of the second bearing member extend parallel tothe axis of rotation of the rotatable bearing assembly, facing surfacesof the first projection of the first bearing member and the secondprojection of the second bearing member abutting to space apart thecentral regions of the first and second bearing members.
 28. The solartracker bearing apparatus of claim 25 wherein a shim is positioned inthe torque tube beam slot adjacent a bottom wall of the torque tube beamslot to adjust a vertical position of a torque tube beam in the torquetube beam slot.
 29. The solar tracker bearing apparatus of claim 25wherein the axis of rotation of the rotatable bearing assembly isoutside of the torque tube beam slot.
 30. The solar tracker bearingapparatus of claim 25 wherein the torque tube beam slot is defined by awall defining a perimeter of the beam slot and includes a central axisextending through the beam slot in direction parallel to the axis ofrotation of the rotatable bearing assembly and the axis of rotation ofthe rotatable bearing assembly is spaced from the central axis of thetorque tube beam slot.